This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A128355 #8 Jun 11 2021 09:45:51
%S A128355 0,5,4,0,14,7,20,11,10,273,14,13,38,89,68,0
%N A128355 Numbers k such that A122735(n) = n^k - k^n.
%C A128355 Currently a(n) is not known for n = {17, 18, 22, 25, 26, 27, 28, ...}.
%Y A128355 Cf. A122735.
%K A128355 hard,more,nonn
%O A128355 1,2
%A A128355 _Alexander Adamchuk_, Mar 05 2007